// Copyright 2014 The ChromeOS IME Authors. All Rights Reserved.
// limitations under the License.
// See the License for the specific language governing permissions and
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// distributed under the License is distributed on an "AS-IS" BASIS,
// Unless required by applicable law or agreed to in writing, software
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// You may obtain a copy of the License at
// you may not use this file except in compliance with the License.
// Licensed under the Apache License, Version 2.0 (the "License");
//
goog.provide('i18n.input.chrome.inputview.StateManager');
goog.require('i18n.input.chrome.inputview.Covariance');
goog.scope(function() {
/**
* The state for the input view keyboard.
*
* @constructor
*/
i18n.input.chrome.inputview.StateManager = function() {
/** @type {!i18n.input.chrome.inputview.Covariance} */
this.covariance = new i18n.input.chrome.inputview.Covariance();
};
var StateManager = i18n.input.chrome.inputview.StateManager;
/** @type {string} */
StateManager.prototype.contextType = '';
/**
* The state of the keyboard.
*
* @type {number}
* @private
*/
StateManager.prototype.state_ = 0;
/**
* The sticky state.
*
* @type {number}
* @private
*/
StateManager.prototype.sticky_ = 0;
/**
* Bits to indicate which state key is down.
*
* @type {number}
* @private
*/
StateManager.prototype.stateKeyDown_ = 0;
/**
* Bits to track which state is in chording.
*
* @type {number}
* @private
*/
StateManager.prototype.chording_ = 0;
/**
* A flag to temporary compatible with the current modifier key state
* managerment, this bit indicates the sticky is set by double_click or long
* press which won't be canceled by keyup or text commit.
*
* @private {number}
*/
StateManager.prototype.finalSticky_ = 0;
/**
* Whether the current keyset is in English mode.
*
* @type {boolean}
*/
StateManager.prototype.isEnMode = false;
/**
* Sets a state to keydown.
*
* @param {!i18n.input.chrome.inputview.StateType} stateType The state type.
* @param {boolean} isKeyDown True if the state key is down.
*/
i18n.input.chrome.inputview.StateManager.prototype.setKeyDown = function(
stateType, isKeyDown) {
if (isKeyDown) {
this.stateKeyDown_ |= stateType;
} else {
this.stateKeyDown_ &= ~stateType;
this.chording_ &= ~stateType;
}
};
/**
* True if the key is down.
*
* @param {!i18n.input.chrome.inputview.StateType} stateType .
* @return {boolean} .
*/
i18n.input.chrome.inputview.StateManager.prototype.isKeyDown = function(
stateType) {
return (this.stateKeyDown_ & stateType) != 0;
};
/**
* Triggers chording and record it for each key-downed state.
*/
i18n.input.chrome.inputview.StateManager.prototype.triggerChording =
function() {
this.chording_ |= this.stateKeyDown_;
};
/**
* True if the state is chording now.
*
* @param {!i18n.input.chrome.inputview.StateType} stateType The state type.
* @return {boolean} True if the state is chording.
*/
i18n.input.chrome.inputview.StateManager.prototype.isChording = function(
stateType) {
return (this.chording_ & stateType) != 0;
};
/**
* Is a state in final sticky.
*
* @param {i18n.input.chrome.inputview.StateType} stateType .
* @return {boolean} .
*/
i18n.input.chrome.inputview.StateManager.prototype.isFinalSticky = function(
stateType) {
return (this.finalSticky_ & stateType) != 0;
};
/**
* Sets a specific state to be final sticky.
*
* @param {i18n.input.chrome.inputview.StateType} stateType .
* @param {boolean} isFinalSticky .
*/
i18n.input.chrome.inputview.StateManager.prototype.setFinalSticky = function(
stateType, isFinalSticky) {
if (isFinalSticky) {
this.finalSticky_ |= stateType;
} else {
this.finalSticky_ &= ~stateType;
}
};
/**
* Sets a state to be sticky.
*
* @param {!i18n.input.chrome.inputview.StateType} stateType The state type.
* @param {boolean} isSticky True to set it sticky.
*/
i18n.input.chrome.inputview.StateManager.prototype.setSticky = function(
stateType, isSticky) {
if (isSticky) {
this.sticky_ |= stateType;
} else {
this.sticky_ &= ~stateType;
}
};
/**
* Is a state sticky.
*
* @param {!i18n.input.chrome.inputview.StateType} stateType The state
* type.
* @return {boolean} True if it is sticky.
*/
i18n.input.chrome.inputview.StateManager.prototype.isSticky = function(
stateType) {
return (this.sticky_ & stateType) != 0;
};
/**
* Sets a state.
*
* @param {!i18n.input.chrome.inputview.StateType} stateType The state
* type.
* @param {boolean} enable True to enable the state.
*/
i18n.input.chrome.inputview.StateManager.prototype.setState = function(
stateType, enable) {
if (enable) {
this.state_ = this.state_ | stateType;
} else {
this.state_ = this.state_ & ~stateType;
}
};
/**
* Toggle the state.
*
* @param {!i18n.input.chrome.inputview.StateType} stateType The state
* type.
* @param {boolean} isSticky True to set it sticky.
*/
i18n.input.chrome.inputview.StateManager.prototype.toggleState = function(
stateType, isSticky) {
var enable = !this.hasState(stateType);
this.setState(stateType, enable);
isSticky = enable ? isSticky : false;
this.setSticky(stateType, isSticky);
};
/**
* Is the state on.
*
* @param {!i18n.input.chrome.inputview.StateType} stateType The state
* type.
* @return {boolean} True if the state is on.
*/
i18n.input.chrome.inputview.StateManager.prototype.hasState = function(
stateType) {
return (this.state_ & stateType) != 0;
};
/**
* Gets the state.
*
* @return {number} The state.
*/
i18n.input.chrome.inputview.StateManager.prototype.getState =
function() {
return this.state_;
};
/**
* Clears unsticky state.
*
*/
i18n.input.chrome.inputview.StateManager.prototype.clearUnstickyState =
function() {
this.state_ = this.state_ & this.sticky_;
};
/**
* True if there is unsticky state.
*
* @return {boolean} True if there is unsticky state.
*/
i18n.input.chrome.inputview.StateManager.prototype.hasUnStickyState =
function() {
return this.state_ != this.sticky_;
};
/**
* Resets the state.
*
*/
i18n.input.chrome.inputview.StateManager.prototype.reset = function() {
this.state_ = 0;
this.sticky_ = 0;
};
}); // goog.scope
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